Title: Performance and emission enhancements of a variable geometry turbocharger on a heavy-duty diesel engine

Authors: Timothy J. Jacobs, Chad Jagmin, Wesley J. Williamson, Zoran S. Filipi, Dennis N. Assanis, Walter Bryzik

Addresses: Texas A&M University, 3123 TAMU, College Station, Texas 77843-3123, USA. ' United States Army, HHC, 10th Mountain Division (G5 Plans), APO AE 09342, USA. ' United States Army, Night Vision And Electronics Sensors Lab, CERDEC, RDECOM, Army Materiel Command, 10221 Burbeck Rd., Fort Belvoir, VA 22060, USA. ' Mechanical Engineering Department, University of Michigan, 1231 Beal Avenue, Ann Arbor, Michigan 48109-2133, USA. ' Mechanical Engineering Department, University of Michigan, 1231 Beal Avenue, Ann Arbor, Michigan 48109-2133, USA. ' Wayne State University, 5050 Anthony Wayne Drive, Detroit, Michigan 48202-3902, USA

Abstract: Variable Geometry Turbochargers (VGTs) have emerged in the heavy-duty diesel market with the simultaneous introduction of Exhaust Gas Recirculation (EGR) in meeting emission standards. From a military perspective, VGTs offer considerable promise of improving low speed torque and overall fuel economy. Despite these gains, nitric oxides (NOx) emissions generally increase with increased boost. During times when the military can reduce its environmental impact, VGTs can drive EGR and counter the increase in NOx emissions with relatively minor penalty in particulate matter (PM) emissions. This study highlights the performance and emission enhancements enabled by a VGT on a heavy-duty diesel engine.

Keywords: heavy-duty diesel engines; VGT; variable geometry turbocharger; EGR; exhaust gas recirculation; engine emissions; engine fuel consumption; heavy vehicle systems; nitric oxide emissions; environmental impact; performance enhancement; emission enhancement; military vehicles.

DOI: 10.1504/IJHVS.2008.022241

International Journal of Heavy Vehicle Systems, 2008 Vol.15 No.2/3/4, pp.170 - 187

Available online: 24 Dec 2008 *

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